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Note 15 - Restricted Cash and Deposits | 12 Months Ended
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Apr. 30, 2021
Notes to Financial Statements |
Restricted Assets Disclosure [Text Block] | Note 15 - Restricted Cash and Deposits: Restricted Money Market Investment in the noncurrent assets on the Consolidated Balance Sheet at April 30, 2021 and April 30, 2020, includes $ 469,000 , which represents cash invested in a bank money market fund securing a letter of credit ("LOC") in the amount of $469,000 issued to the sublandlord as a security deposit for the Company's New York City leased corporate office facility. Effective October 3, 2021, the LOC and restricted cash will be reduced to $305,000 according to the lease agreement.

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- Definition The entire disclosure for assets that are restricted in their use, generally by contractual agreements or regulatory requirements. This would include, but not limited to, a description of the restricted assets and the terms of the restriction. + References No definition available. + Details
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